Entrance for slot type forge heating furnaces



Patented Sept. 19, 1944 ENTRANGEFOR. SLOT( TYPE FORGE I I Y HEATING FURNACES Theodore Kauffman, Jr., Chicago, and George Campbell, Riverside, Ill., assignors to The S bel-mayer C ChicagO, Ill., a corporation of..

Ohio

Appiication. May z5, 1942, serial No, 444,481Y .-4 claims. i (c1. 26a-*46) This invention relates to an improved'entr'anc'e" fora slot type forge heating furnaceV and in pa'rjticular to an improved refractory wall construction for use in providingthe" slotted entrance of furnaces of this type.

The principal purpose ofthe invention is`to p io` vide means whereby a rectangular slot type of opening may be provided in the furnace wallwithout recourse to a radial'arch. Such radial arches above referred to are of the type'shownin the Hosbein Patent No. 1,628,284. Such arches are common in boiler furnaces but impractical for this type of furnace.A A spring archis unnecessarily Wide at the center. Brick could be clamped in place but that causes spalling and is dicult.

The preferred embodiment of the invention herein described is shown in connection with a furnace provided with a monolithic refractory lining, althoughit is-obvious that this invention may be used in connection with furnaces having other types of linings.

The advantages of a monolithicrefractory lining are well understood in the art. Such a lining is obtained by laying a wall of 'plastic re-V fractory material against the structural wall of the furnace and vitrifying the refractory wall in situ.` Means are provided to anchor the refractory to the structural wall and such means are often in the form of refractory blocks. Ihes'e blocks, however, .are not of sufficient structural structural member is often necessary.

Whereas in the entrance of a slot type forge heating furnace a steel'member could be used, the presence of hot gases in and about the entrance makes it necessary to protect the slot itself with a refractory.

It is a principal object of this invention to prof vide an entrance for a slot type forge heating furnace which is lined with refractory and which is capable of supporting the hanging wall above the entrance.

It is also an object of this invention to provide supporting anchor blocks for such a hanging wall which can be mounted upon a structural member and which will protect the structural member from heat.

In this connection it is also important to arrange the anchor blocks with respect to the structural member so as to permit a limited amount of expansion and contraction Without affecting the wall which is supported thereby.

In the drawings in which like numerals refer to like parts, Fig. 1 is a sectional view of a furnace embodying a preferred embodiment of this strength to support a hanging wall andY a steel' invention, the section being taken along line I`I of Fig. 2; j

Fig. 2 is an elevation of the furnacel shown'in Fig. 1, the elevation being taken along line 2-2 ofFig.1; v 'i Fig. 3 isa sectiontaken along line 3--3 'of Fig.2;and

Fig. l is a perspective v i'ew'of one'of the anchor blocks shown in the above figures.'

Reference numeral Illv designates a furnace,l

one opening of which is in the forrn'ofl a,v rectangular slot. The Vsupporting 'structure consists of' vertical supporting members I Ilof angleiron together with horizontal ,topv supportingY members" i2 and horizontal bottom sul) pori-.ing members I3 secured'thereto. The structural vwalls, ofthe Yfurnace are formed of steel plates I 4 which' are secured to the several supporting members. The furnace is provided with a monolithic refractory lining I8. A liningof heat insulating material I5 covers the top of the furnace, this insulation being applied directly over the refractory. YSimilar heat insulatinglining .IiiY isinterposed at the bottom of the furnace,` between kfthe refractory lining I8 and the steel plate,I I4 which forms the structural bottom wallof the furnace. A similar layer of heat insulating, material 'I1 is provided at the front wall of the furnace., 1

The side walls are provided with ports I9 by means of which fueli and air` maybe .Supplied to the interior of thefurn'ace.'

The entrance tofthefurnaceis in form of l a slot 21.'. A steel channlZU extends .acro'ss the.

front of the furnace andforms a part ofthe structural wall of the furnace immediately above the slot 2I. A series of castings 22 are fastened to the channel 20 and extend inwardly from the:

channel 2li. 'Ihese castings have downwardly ex-V tending ledges 22a. It will be noted also that at `the inner edge of each casting a lug 23 projects upwardly. The castings 22 are spaced apart They have lips 22D overlying the channel 2li. A plurality of refractory blocks 24 are provided with slots 25 and are fitted onto the I castings 22 in side by side relationship. These blocks form the top wall of the slot 2 I. The slots 25 of the blocks are of similar configuration to the castings 22; that is, they are provided with channels 29 to accommodate the upwardly eX- tending lugs 23 of the castings 22. The castings and blocks are offset so that the blocks cover the spaces between castings. Y

The side surfaces of the block 24 which are immediately above the slots 25 are offset as at 26 to accommodate the layer of heat insulating material I1. The upper surface of each block is provided with a number of grooves 21 as shown in Fig. 4 so as to interlock with the monolithic refractory lining I8. It will` be noted that this upper surface is not parallel with the bottom surface of the block, but rather it forms an. acute Y therein, an originally plastic monolithic refractory lining therefor and means providing a straight horizontaltop wall for said opening and supporting and retaining said lining over the opening comprising a supporting member running longitudinally of said wall above said slotted portion,V blocks carriedon-said supporting member Vand extending downwardly and backwardly against the same and providing a downwardly facing wall extending inwardly from the slot opening, the blocks having top surfaces sloped downwardly toward the retaining wall and said of the 'casting with respect to the block without disturbing the position of the block itself. In

other words, the block rests solely on the top surface of the casting and the upwardly projecting lug 23 of the casting interlocks with therblock to hold it in place. The swing `or rotational tendency of the block is taken up by the depending ledges 22a on. the castings. The vlower outer faces ofthe blocks press against the ledges 22a.

Y The Vconstruction herein disclosedv affords proper support for the wall above the entrance of a slot type furnace, and it permits the use of an originally plastic monolithic refractory material .for said wall. The refractory blocks herein disclosed not only serve to anchor and support the originally plasticY refractory material but they form a flat top wall for the opening 2l and completely protect the steel supporting channel 20 from the heat of the furnace.

.It is obvious that various modifications and changes inthe construction herein disclosed may be made' without departing from the spirit of our invention. ,'Ihe'above description and drawings are intended to illustrate only a preferred embodiment of our invention; the invention is to be limited only'by the appended claims,

We claim:

A refractory block for supporting a plastic Wall over-fthe Ventranceslot in a vforge heating furnace 'and forming the top wall of said slot, said block being provided with a slot at one side surface thereof whereby said block may t over a su'pporting casting to protectthe innerface and vtop of said'casting, the upper surface of said block being disposed atanv acute angle to the'fur-V nace wall and being provided with a plurality of projectionslcon'structed to interlock with an-originally'plastic refractory material in place abov said block and supported thereby. i

'2. A'furnace wall structure Vembodying a re-I taining' wall, a narrow rectangular opening lining being packed tightly against said top surfaces, said blocks being made of a refractory material vso as to protect said supporting member from the heat of the furnace.

3. A furnace structure comprising a structural steel wall disposed above a slotted entrance, an originally plastic monolithic lining for said furnace and means to anchor and support said lining at a point above said slot, said means comprising a beam spaced above the loweredge of saidsteel'wall and secured thereto, supporting castings thereona refractory shelf for support'- ing said lining, 'said shelf consisting o f refractory blocks resting on said castings` and being extendeddownwardly and along the VVinner side of said'castings to Vforma refractory lining for the entrance to said furnace, 's aid blocks having downwardly facing surfaces: extending inwardly from the lower edges of the castings' to provide a refractory top wall rfor the entrance slot, said blocks being provided with ribs interlocking with said lining to anchor said lining in place against said wall.

4.` An entrance for a slot type forge heating furnace having a structural steel wall, said. entrance comprising a layer of'refractory material forming the lower Wall of said entrance, said layer of refractory material being extended throughout the interior of said furnace, and a plurality of -refractory blocks forming the upper interior wall of saidrentrance, said blocks being mounted with respect to the structural steel wall for said furnace, and being provided with upperv I'I-moDoRE 'KAUFFMAN JR; GEORGE v. .CAMEBEIL. 

